cool ill have to look in to those a bit more.

so moving on for my goal of cutting alli is 2005 ball screws for the two on the x and 1605 for y and z the right ones to go for?

Any idea on the ali gantry, I know jazz uses them a lot on his but not sure if they are all designed for the same purpose? it would certainly make my life easier if I didn't need to use steel.